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Author Topic: 1979 CB650 rear bumper  (Read 389 times)

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Offline jsmith800

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1979 CB650 rear bumper
« on: February 08, 2024, 11:36:30 am »
Any idea why my rear bumper has a cut straight thru it?  Almost looks like it was like this during production but not sure.
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Offline jgger

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Re: 1979 CB650 rear bumper
« Reply #1 on: February 08, 2024, 02:06:11 pm »
No cut on mine. Maybe after market for optional rack or sissy bar..
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Online CycleRanger

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Re: 1979 CB650 rear bumper
« Reply #2 on: February 08, 2024, 05:04:03 pm »
Looks like the weld has cracked at a seam.
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Offline CBJoe

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Re: 1979 CB650 rear bumper
« Reply #3 on: February 08, 2024, 05:09:21 pm »
Quote from: CycleRanger on February 08, 2024, 05:04:03 pm
Looks like the weld has cracked at a seam.

Agree...is it cracked like that on both sides?  or just one?
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Offline jgger

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Re: 1979 CB650 rear bumper
« Reply #4 on: February 08, 2024, 06:20:00 pm »
There is no seam or Weld on my stock one. If you remove the bolt by the joint, does it come apart? It looks like the back piece is swedged to fit inside the front part, if that split is on both sides.
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"The SOHC4 uses a computer located about 2-3 ft above the seat.  Those sometimes need additional programming." -stolen from  Two Tired

The difference between an ass kisser and brown noser is merely depth perception.  Stolen from RAFster122s

Offline newday777

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Re: 1979 CB650 rear bumper
« Reply #5 on: February 09, 2024, 03:09:39 am »
Quote from: jsmith800 on February 08, 2024, 11:36:30 am
Any idea why my rear bumper has a cut straight thru it?  Almost looks like it was like this during production but not sure.
I don't think it is original that way.
Can you take it apart? Is there a barrel added inside the front section to slide the rear section onto? 🤔
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Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
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Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
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Offline pekingduck

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Re: 1979 CB650 rear bumper
« Reply #6 on: February 12, 2024, 01:25:44 pm »
Cracked simply from vibration and/or stress. I have seen it on crash bars, luggage racks, etc. when bike is tied down/held down on a trailer or truck for long periods.  I never use ratchet straps for that reason.
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